Guard and workholder for planers



1:11:28, 1930. w. w. EDWARDS GUARD AND WORKHOLDER FOR PLANERS Filed Jan.50, 1929 awn-too IVZZZZa/n W Edd/070 5.

Patented Jan. 28, 1930 WILLIAM, w. nnwnnns, or Los ANGELES, CALIFORNIAGUARD AND WORKHOLDER FOR PLANERS Application filed January 30,1929.Serial No. 336,257.

This invention is an improvement on the disclosure in my co-pendingapplication for patent, Serial No. 243013, filed December 28,

1927, and it relates to a guard and work 5 holder for planers.

, An object of the invention is to facilitate adjustment of the pressureof the rollers upon the work.

Another object is to make provision for 10 clamping the suspending armof the bracket to the rod that supports the roller carrier.

Further objects and advantages will appear in the subjoined detaileddescription. The accompanying drawings illustrate the invention:

Fig. 1 is a front view of a guard and work holder constructed inaccordance with the provisions of this invention, a planer table beingfragmentarily indicated by broken lines.

Fig. 2 is an elevation of Fig. 1 from the right thereof. 7

Fig. 3 is an enlarged plan View from the line indicated by 33, Fig. 1,portions being in section on said line, andportions of the clampingjaws'being shown in section to disclose the spring that forces themapart.

Fig. 4 is an enlarged broken plan View from the line indicated by44,,Fig. 1, portions being in section on said line. I

Fig. 5 is an enlarged fragmental elevation viewed from the line 55, Fig.2.

Fig. 6 is anenlarged vertical section on the line indicated by 66, Fig.3.

Referring to the drawings, a planer table is indicated at A, and, as isusual, is provided with a transversely extending slot B and with rotaryknives C which are fixed in a cylindrical driven member D. The foregoingdescribed elements are familiar to those versed in the art relating toplaners, and it is to be understood that, in this specification, theterm planers defines not only planers but jointers and other machinessimilar in construction to planers.

Positioned along opposite margins of the slot B are rollers 6 which maybe formed of any suitable material such as, for example, hard wood. Theaxes of the rollers 6 are indicated at 7, and are supported by endflanges 8 of a U-shaped member, which also comprises a horizontal member9 connected at its ends to the flanges 8. The U-shaped memberconstitutes acarrier for the rollers 6, and projecting upwardly from themember 9 are guide stems 10, there being two in this instance. The guidestems 10 are slidably mounted in vertical holes 11 formed in ahorizontally positioned arm 12 of a bracket which is indicated, ingeneral, by the character 13. The bracket 13 comprises the arm 12 and,also, a standard 14 which adjustably supports the arm 12. The arm 12 isslidably mounted inv a horizontal groove 15 formed in a horizontallyextending head 16 of the standard 14. 'Thus, the arm 12 can be ad'-justed endwise in a horizontal plane and, when adjusted to the desiredposition, said arm may be secured by a suitable clamping means which maycomprise a cap screw 17 screwed into the head 16'along the median lineof said head. The cap screw 17 projects upwardly through a slot 18 thatextends lengthwise of the arm 12. Beneath the head of the cap screw 17is a washer 19 that bears upon the upper face of the arm 12 when the capscrew 17 is tightened.

The member 9 of the roller carrier is provided with a third upwardlyprojecting stem 20 which is positioned between the stems 10 and passesthrough a vertical hole 21 in the arm 12. A meansis provided toreleasably clamp the arm 12 to the stem 20 so as to support the carrierat any desired elevation and this means, in this instance, isconstructed as follows: 2 I

Embracing the stem 20 are clamping jaws 22 provided with semi-circularrecesses 23 that, together, form: an opening through which the stem 20extends. Recesses 23 are faced or lined with friction material such, forexample, asrubber, as indicated at 24, so thatsaid friction faces Willengage opposite sides of the stem 20 when the jaws 22 areforcedtowardeach'other. The elements 24, in this-instance, are simplyrubber bands that are slipped over the jaws 22. The jaws 22 arepivotally connected at 25 to a support 26, which may be in the form of aplate provided near its opposite endswith holes 27 through which thestems 10 pass. The pivots 25 which, in this instance, are merely capscrews screwed into the plate 26, also pass through a plate 28, andprojecting up from the plate 26 are abutments 29 adjacent to the outersides of the jaws 22, so as to limit movements of said jaws away fromeach other.

The jaws 22 are opened and yieldingly held in open positions by a coilspring 30 which has its opposite ends seated in alined recesses 31 inthe inner faces of the jaws 22. Thus, the expansive force of the spring30 urges the jaws 22 away from each other or, into the unclampedpositions, so that the plate 26 can be slid up and down on the stems 10,20. This sliding up and down of the plate 26 is accompanied by similiarshifting of the arm 12, since said arm 12 is connected with the plate26. In this instance, the means for connecting the arm 12 and plate 26comprises studs 32, which may be in the form of: bolts screwed into thearm 12 and projecting downwardly from said arm. The studs 32 passthrough holes near the corners of the plate 26 and function as guidesfor movements of the plate 26 relative to the arm. The heads 34 and thestuds 32 limit motion of the plate 26 away from the arm 12.

A latching means is provided to latch the jaws 22 in their closedpositions or, in other words, in positions to eflectively grip the stem26 so as to prevent relative motion between said stem and the jaws 22.In this instance, the latching means comprises a latch memher 341pivoted at 342 to one end of one of the jaws 22 and said latch member isprovided with a slot 343 opening to the lower edge thereof so that whenthe latch member is substantially horizontal, as in Fig. 5, the slot 343will be engaged by a shoulder 344 that, in this instance, is in the formof a stud projecting from one end or the other of said jaws. The slot343 is cam-shaped so that when the latch member is forced downwardlyfrom the position indicated by broken lines in Fig. 5 to the positionshown in the solid lines, the jaws will be gradually forced toward eachother.

Surrounding the studs 32 are coil springs 35, the pressure of whichthrough the plate 26 and clamp jaws 22 is transmitted to the stem 20,thence to the roller carrier and, finally, to the rollers 6. The degreeof compression of the springs 35 can be regulated y moving the plate 26relative to the arm 12 and then clamping the plate 26 in the adjustedposition. The means for moving the plate 26 against the pressure of thesprings 35 may be of any suitable construction and, in this instance,comprises a rotatably mounted cam 36 working against followers 37 whichare shoulders provided on pins 38 that are screwed to the plate 26 andproject upwardly therefrom through holes 39 in the arm 12, and

through holes 40 in a cross bar 41 positioned on the stem 20 above thecam 36. The pins 38 are provided above the cross-bar 41 with nuts 42.The stem 20 extends axially through the cam 36 and thus constitutes theaxis upon which said cam turns, and the cam rests upon the upper face ofthe arm 12. The diametrically opposite cam faces that en age theshoulder 37 are indicated at 43. The head 44 on the upper end of thestem 20 is simply for the purpose of facilitating lifting of the guardwhen in the act of assembling it in place on the planer.

The lower end portions of the stems 10, 20 are fastened by any suitablemeans in the member 9 as, for example, by pins 45.

The standard 14, preferably, is adjustably mounted longitudinally alongthe table A and, for that reason, the lower end of the standard 14 isprovided with a horizontal flange 46 in which are longitudinallyextending slots 47. Through the slots 47 extend cap screws 48 which aresecured in the table A. Preferably. the cap screws 48 are provided withwashers 49 that lie on the upper face of the flange 46.

To use the invention, the parts will be mounted as shown in thedrawings, so that the rollers 6 extend along the margins of the slot B,the flange 46 being adjusted longitudinally of the table A and the arm12 being adjusted transversely of said table so as to properly positionthe rollers. In practice, it is found of advantage to position the partsthat support the rollers so that the angle between the planer edgeguide, not shown, forwardly of the roller 6, and the axes of saidrollers is slightly less than a right angle.

The material that is to be run through the planer will be placed on thetable A, beneath the rollers 6, and the jaws 22 will be unlatched soasto free the stem 20 and permit the rollers to rest upon the work onthe planer. At this time, the pressure of the rollers on the work isonly equal to the weight of the rollers and parts supported thereby.Ii": additional pressure of the rollers 6 on the work is desired, thecam 36 will be turned by the operator in a direction to effect raisingof the plate 26 and consequent further compression of the springs Thefurther the cam is turned in this direction, the greater will be thecompression of the springs 35. lVhen the desired tension has been placedon the springs 35, the jaws 22 will be latched so as to firmly clampthem to the stem 20, thus making efi 'ective the expansion force oi thesprings 35 for producing additional. pressure of the rollers 6 on thework.

The operator now removes the work from the planer, starts the same inoperation, and then thrusts the piece to be planed beneath the rearmostroller 6, and forces said piece forwardly with one of its edges incontact with the planer guide not shown, so as to plane the under faceof said piece in a manner well understood in this art. It will be seenthat it is impossible for any part of the operators hands toaccidentally come in contact With the planer knives, thus insuringagainst injury to the operator. The guard is always in a protectiveposition whether or not work is being run through the planer andregardless of the thickness of the piece being operated upon. If piecesof materially difierent thickness than those being run through theplaner are to be operated on, the rollers may be readjusted by firstreleasing the jaws 22, so as to have only the weight of the rollers andthe parts supported thereby on the work, whereupon the desiredadditional pressure will be produced in the manner hereinbeforedescribed.

It is preferable that the rear one of the rollers 6 be of slightlysmaller diameter than the front roller, as seen in Fig. 2, so that,

I when the piece to be planed reaches the front roller and raises saidroller, the rear roller will be free from engagement with the piecebeing operated on. The front roller alone then holds the piece firmlydown upon the table A, while the rear roller simply functions as a guardfor the knives.

I claim:

1. In an attachment for planers, a bracket attachable to the planer andprovided with a horizontally projecting arm, a roller carrier beneaththe arm shiftably connected therewith for vertical movement, a clampingmeans connected with the arm releasably holding the roller carrieragainst shifting, rollers mounted on the carrier to extend approximatelyparallel with the planer knives on opposite sides of said knives, and ameans yieldingly pressing the carrier downwardly.

2. In an attachment for planers, a bracket attachable to the planer andprovided with a horizontally projecting arm, a roller carrier beneaththe arm, guide stems shiftably connecting the carrier with the arm,another stem projecting upwardly from the carrier, clamping j awsadjustably connecting, the last mentioned stem with the arm, and meansyieldingly forcing the last mentioned stem downwardly, and rollersmounted on the carrier to extend approximately parallel with the planerknives on opposite sides of said knives.

3. In an attachment for planers, a bracket attachable to the planer andprovided with a horizontally projecting arm, a roller carrier beneaththe arm, guide stems shiftably connecting the carrier with the arm,another stem projecting upwardly from the carrier, a clamping means toclamp the last named stem against movement, spring means yieldinglyforcing the clamping means downwardly, and means to lift the clampingmeans relative to the arm to adjust the tension of the spring means, androllers mounted on the carrier to extend approximately parallel with theplaner knives on opposite sides of said knives.

4:. In an attachment for planers, a bracket attachable to the planer andprovided with a horizontally projecting arm, a roller carrier beneaththe arm, guide stems shiftably connecting the carrier with the arm,another stem projecting upwardly from the carrier,

7 a member shiftably connected with the arm,

a clamping means mounted on said member and engageable with the lastmentioned stem, spring means forcing said member away from the arm, ameans to adjustably move said member toward said arm against thepressure of the spring means, and rollers mounted on the carrier toextend approximately parallel with the planer knives on opposite sidesof said knives.

5. In an attachment for planers, a bracket attachable to the planer andprovided with a horizontally projecting arm, a roller carrier beneaththe arm, guide stems shiftably connecting the carrier with the arm,another stem projecting upwardly from the carrier, a member connectedfor vertical movement with the arm, a clamping means mounted on saidmember and engageable with the last mentioned stem, a spring meanstending to move said member downwardly, a means to positively limitdownward motion of said member, a means to move said member toward thearm to compress the spring means, and rollers mounted on the carrier toextend approximately parallel with the planer knives on opposite sidesof said knives.

6. In an attachment for planers, an arm, a roller carrier beneath thearm, a guide means connecting the carrier with the arm, a stemprojecting upwardly from the carrier, a member beneath the armadjustably connected therewith, a spring means tending to move the armand said member away from each other, jaws pivotally mounted on saidmember and engageable with the stem, a latch means to clamp the jaws onthe stem, and rollers mounted on the carrier.

7 In an attachment for planers, an arm, a roller carrier beneath thearm, a guide means connecting the carrier with the arm, a stemprojecting upwardly from the carrier, a member beneath the armadjustably connected therewith, a means to raise said member relative tothe arm when the jaws are released, jaws pivotally mounted on saidmember and engageable with the stem, a latch means to clamp the jaws onthe stem, and rollers mounted on the carrier.

Signed at Los Angeles, California, this 18th day of January, 1929.

WILLIAM W. EDWARDS.

